[linux-lvm] questions on LVM2 and device mapper

[Alexey Shinkin]

Hi , All !

A couple of questions on LVM2 and device mapper :

1. How corresponds logical devices in DM and  logical volumes in LVM2 ?
  are they the same things ?

2. In LVM1 some I/O statistics were available for a LV (using ioctl we could 
see reads/writes for
each allocated PE in LV structure) . Is there such thing in LVM2 ?  How can 
I get a  number of reads/writes for a LV ?

Thanks

Alexey Shinkin

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